Locking device



FIG. 1 is a perspective view;

FIG. 2 is a front view;

FIG. 3 s a top view;

FIG. 4 is a left side view;

FIG. 5 is a rear view;

FIG. 6 is a bottom view; and,

FIG. 7 is a right side view.

The device is a locking device. The broken lines in FIGS. 1 and 5 depict portions of the locking device that form no part of the claimed design. 

CLAIM The ornamental design for a locking device, as shown and described. 